Malicious PDF — malware analysis report

Static analysis result for SHA-256 278e62efa3258876…

MALICIOUS

PDF

79.1 KB Created: 2021-10-07 19:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4135b4855b2df8e6a4cdc0bd44dbe072 SHA-1: bae1ac0d1c9049c2cc5b64b929c9a50d91d7f0ae SHA-256: 278e62efa32588762abfc0c87d055c419e2b4746307f57f23f66f9d1e5c827c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/maditinujelinebipumabon.pdf In PDF document text
    • http://sissonne.hu/editor_up/6890221337.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/94115965775.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/51873452047.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/27199461666.pdfIn PDF document text
    • http://dd-eng.com/files/files/63968370154.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/legev.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/46362506116.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383f5bbe33b---kesigufopopupovixo.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/wetugiwoxonidolipura.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/tewewewadusozonejotosati.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/lixujab.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5fa464f48---79707264545.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/dujabodizisoreketi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chasing+cassandra+the+ravenels+read+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC6 18644 bytes
SHA-256: 0cd9e8e97c74b7f19fbd04cbe8dc9e8b97ca7758462f20a50b42d12deb67d307
font_01_sfnt_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 10852 bytes
SHA-256: bbbc32fe276d96f5ace6b73f987967d7167f73b4c46260631f57b19a3c3f7f34
font_02_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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